1861072672 has 24 divisors (see below), whose sum is σ = 3672175500. Its totient is φ = 928456704.

The previous prime is 1861072663. The next prime is 1861072691. The reversal of 1861072672 is 2762701681.

It can be written as a sum of positive squares in 2 ways, for example, as 1756951056 + 104121616 = 41916^2 + 10204^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50397 + ... + 79132.

Almost surely, 2^1861072672 is an apocalyptic number.

It is an amenable number.

1861072672 is a deficient number, since it is larger than the sum of its proper divisors (1811102828).

1861072672 is a wasteful number, since it uses less digits than its factorization.

1861072672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129988 (or 129980 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1861072672 is about 43140.1515064563. The cubic root of 1861072672 is about 1230.0453135090.

The spelling of 1861072672 in words is "one billion, eight hundred sixty-one million, seventy-two thousand, six hundred seventy-two".